Reinforcing-bar.



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UNITED STATES PATENT OFFICE.

'WILLIAM 1. WITHEROW, OF PITTSBURGH, PENNSYLVANIA.

BEINFORGING-BAR.

T0 all whom t may concern:

Be it known that I, WILLIAM P. WITHE- Row, a citizen of the United States, and a resident of Pittsburgh, `in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Reinorcing-Bars, of which the following is a specification. A

This invention relates to a reinforcing bar for use With cementitious substances, such as concrete for building and other purposes.

One object of the invention is to provide a reinforcing bar which has on the surface of a regularly formed central body projections which lcrm a mechanical bond with the concrete in which the bar is embedded,-

thereby decreasing the likelihood of rela-tive movement between the bar and concrete, and

increasing the. strength of the structure. A

further object of the invention is to provide a bar in which the projections are so arranged that, inclusive of the projecting material, the bar is of substantially uniform. cross section throughout its length, so that the bar 1s of uniform tensile strength throughout, and all of lthe metal of the projections contributes to the strength of the bar.

Each of the forms of bar embodying the essential features of the present invention comprises a plurality of longitudinal and .substantiallyV parallel ribs projecting 'from a regularly formed central body; these ribs providing portions having shoulders for interlocking with the concrete, and being so formed that the bar has a substantially uniform cross sectional area throughout its length, and so arranged that it presents a Well balanced surface of projecting material and one in which the locking shoulders are most advantageously distributed on all sides of, or around, the bar.,

In prior forms of bar in which ribs of a somewhat similar nature have been employed, these ribs have been either of a continuous zig-zag. or sinuous form, or have consisted of snort isolated zig-zag projections. Both of these forms are open to serious objections in actual rolling mill practice, since both, particularly the form. havin isolated zig-zag projections, have been -ound dicult to chip` or plane into the faces of Speccation of `Letters Patent.

Application led September 11, 1916.

Patented Feb. 5, 1918.

seriai No. 119,455.

.the rolls. With the continuous zig-zag forni, moreover, sticking or" the bar-in the rolls during the roiling operations isof tren quent occurrence, While with the formshowing isolated zig-zags, delicate adjustment of the rolls is requisiteto even approximate uniform cross sectional area of the bar.

Further and novel-objects of the present invention are therefore, to provide a bar ein` bodying the advantages above enumerated for which rolls may be readily chipped or planed, which does 4not subject the rolls to excessive wear in operation, which is not apt to sticlr in the rolls due to coi'istant change otdirection of the ribs on every face, and which may be producedwith a substann itally uniform area in cross section i-rrespective oimatching of the/rolls.

These objects are attained in the present form of bar by so forming the longitudinal ribs that each comprises a plurality of sinuous or zig-zag portions connected longitudinally of the bar by straight longitudinal portions. This forni of bar, while furnishA ing eflicient means for interlocking with cementitious material, also con'iprises a form of rib which does not necessitate abruptly terminating grooves within the' face of the rolls. In rolling, moreover, the stresses on the rolls are relieved, and the probability of sticking of the stoclr in the rolls lessened, by reason of the straight longitudinal por-V tions connecting the sinuous portions. A Well balanced distribution of the locking members is obtained by so staggering adj acent ribs around the bar that the sinuous portions of each rib lie opposite the straight portions of the adjacent ribs on either side.

In the accompanying drawings, Figure 'l is a perspective view of one modification ein.-

bodying the principles of `the invention;A

creased ease of formation of the rolls; Fig..

i rolling secured by the longer legs at (i.

1]. is a cross sectional 4View thereof on the line limiti Fig. 10; and Fig. l2 is a development oil. the loro; ol' our shown 1n Figs. 10 and li..

The bar sliown in l to inclusive, is

provided with a plurality ol sinuo'us or zigportions is sist relatiro be bar and con en the sli elders and .legs ons 'l resisting both lon ment oi' the bar vliicb it is ern-- por ons l assist materially in i. f any turning more ment oi tbe bar. is shown clearly in Fig. 2. the riliis relatively se staggered tls-.at each oi, the sinuous and straight portions is positioned opposite a portion or' dissimilar nature :in tigre adiacent ribs on either side. Tige shoulders 'i may be inade to forni a clean out angle, as shown', but in practice are more usually slightly rounded for convenen 'n turning the cutting tool while lfornii g oi tire rolls.

modified 'torni ci liar shown in liigs., i at illus' in lFigs. the exception that i. .A provided tbus increasing vlx of botii the einuous and straight b "ouate amount.

i a ribbei r oi 1n eacii ci the i l number ot' can-- n t g? fatly teased beyond torni oi? Jar Without sac the increased ease of avoiding a continuous orniof rib. The forni of bar shown preferred to'tlle toon oi: Figs. 4. and since the alternations of sinuous and straight portions. are more frequent thus shortening extent of each of tbe sinuous portions, and giving increased ease in rollin 1 The inodied bar illustrated in Figs. 6 and 7 is also substantially similar to the form shown in Fig. l. the point of dilierenee between these bars being that instead of the sharp corners i and 'l' provided in the ribs of tile preferred forni, tlie entire body of eaciu siuuous portion throughout its length is smoothly curved, and the points of june tion 8 between the shorter legs and the `that shown in this materially sin;a ag in Figs. 1 to il is slightly rename l in which the bar is embedded.

The modification illustrated in Figs. 8 and 9, shoe-s a plurality of diagonal legs 3 in eacli of the sinuous portions 1, `our such legs being shown. These legs extend eniirely across each face of the bar', and the outer legs of longitudinally adjacent sinuous portions are connected by straight portions 2, which are run along the corners of the bar in lie form of beads.

ln tlie modification illustrated in Figs. 10, 11 and l2 the sinuous portions of the ribs' comprise a plurality of connected legs extending the Width of each face of the bar diagonally thereof, and straight portions 2 connecting the` outer legs of adjacent suiuous portions partway of the length oi' such legs. This bar does not present an absolute uniformity of cross sectional area tbrouglioute the portion of each outer leg 3 between the dotted lines A-A and B1B, Fig. 10. being obviously. surplus metal,v It does, however, present the advantage,that in forming the faces of the rolls by'pla-ning, at each cut the tool may be carried through to ille edge of that face oi thel roll Vwhich is under process of formation, thus giving a slightly increased facility in forming the rolls and thereby compensating for the small amount oi surplus metal employed.

Although all modications shouT the bar as square, the ribs of all forms may be equally Well applied to a round or oval bar, or to bars which are of rectangular or polygonal cross sections, the only limita tion being that the bar be regularly formed in order that the rolls may be standardized and readily replaced. In the case of a flat or oval bar, two longitudinally disposed ribs will clearly provide tlg'e desired distribuH tion of projecting material. The bar is also susceptible of a number of modifications, in addition to those illustrated, Withoutl departing from theA essential principles and features of the invention.

What I claim im l. A metallic reinforcing 'bar for cementi'ev longitudinal ribs, said ribs having-sinuous' portions and substantially straight'portions comiec'ting adjacent sinuous'portions longitudinally of the bar. y

2. .A metallic reinforcing bar forl cernentb tions bodies comprising a regularly formed central body. 'providedwitha plurality' of longitudinal' ribs,

said ribs havmg' sinuous.

tudinally of the bar, adjacent ribs havingtheiicorresponding portions relatively staggere 3. A metallic reinforcing bar for cernenti tions bodies comprising a regularly formed central body provided with a plurality of longitudinal ribs, said ribs having sinuous portions and substantially straight' longitudinal portions; said sinuous portions being formed of a plurality of connected legs extending a substantial distance diagonally oi the bar and shorter legs connected therewith, the straight portions being arranged to connect the shorter legs oi' adjacent sinnons portions longitudinally of the bar.

4. A metallic reinforcing bar for ceinentitions bodies comprising a regularly formed central body provided with a plurality oi' longitudinal ribs, said ribs having sinnous poi-'tions and substantially straight long-itudinal portions; said sinuous portions being formed of a plurality ot' connected legs extending a substantial distance diagonally oli' the bar and shorter legs connected therewith, the straight portions being arranged to connect the shorter legs ol adjacent sinuous portions longitudinally of the bar, and adjacent ribs having their corresponding portions relatively staggered.

5. A metallic bar for ceinentitious bodies comprising a regularly torined'central body provided with a plurality of longitudinal ribsj said ribs having sinnous portions formed of connected diagonal projections meeting in sharp corners,v and substantially straight portions connecting adjacent sinuons portions'longitudinally chille bar.

G. A metallic reinforcing bar for ccnientitions bodies comprising a regularly formed central body provided with a plurality ot' longitudinal ribs, said ribs having sinuous portions formed of connected diagonal pro` jections meeting in sharp corners, and substantially straight portions connecting adjacent sinuous portions longitudinally of the bar, adjacent ribs having their corresponding portions relatively staggered.

7. A metallic reinforcing bar for cementitions bodies comprising a regularly formed central body provided with a plurality of longitudinal ribs, said, ribs having sinuous portions and substantially straight longitudinal portions; said sinuous portions be ing formed of a plurality of connected legs extending a substantial distance diagonally of the bar and meeting in sharp corners, and shorter legs connected therewith, thestraight portions being arranged to connect the shorter legs of adjacent sinuous portions longitudinally of the bar.

8. A metallic reinforcing bar for cementitions bodies comprising a regularly formed central body provided With aplurality of longitudinal ribs, said ribs having sinuous portions and .substantially straight longitudinal portions; said sinuous portions being formed oi' a plurality ol'l connected legs, extending a substantial distance diagonally of the bar and meeting in sharp corners, and shorter legs connected therewith, the straight portions being arranged to connect the shorter legs of adjacent sinuons portions longitudinally of' the bar, andadjacent ribs having their` corresponding portions relatively staggered.

Irl-:testimony whereof, I have hereunto set niy hand.

.WILLIAM r. WITHERov'v.

Witnesses:

Giras. V. GRIFFITH, y Wir. G. lA'rT. 

